THE REASON WHY SOME HEAR IT AND SOME DON,T IS IT,S THE NANO TECH COMING ONLINE , ONCE THE NANO STRUCTURAL ARRAY IS GROWN TO COMPLETION, AND ALL THE COMPONENTS ARE THERE YOU ARE AUTOMATICALLY SIGNALED IN TO A TRACKING COMPUTER SYSTEM , FROM THIS POINT ON COHERANT SIGNALS CAN BE SENT MONITERED AND RECIEVED.DON,T WORRY WE WILL ALL EVENTUALLY HEAR THE HUM